Doctor bar



Aug. z8, 192s.

C. IVES DOCTOR BAR Filed Jan. 16, 1928 INVENTOR /m/e /Vea Bg kw@ ATTORNEYS Patented Aug; 28, 1928i.J

UNITED s'raxrlss PATENT 'oFFlcI-L.

(II-AUDE I'VES, OF OTSEGO, MICHIGAN, ASSIGNOB OF ONE-HALF TO @HARLEY PIERCE,

OF MARTIN, MICHIGAN.

DOCTOR BAR.

Application led January 16, v`1928. SerialLNo. 247,130.

The main objects of this invention are:

First, to provide an improved doctor bar for the rolls of paper making machines and the like which is highly ellicient for the purpose and at the same time results in a minimum of wear on the rollfor cylinder;

. element can be quickly and easily renewed as occasion( requires and is economical.

Objects pertaining to details and econo mies of my` invention will definitely appear from the description to follow. The invenn tion is defined in the-claims.V

A structure embodying Vthe features of my invention is clearly illustrated in the accompanying drawing in which:

Fig: 1 is a fragmentary view showing my improved doctor bar inoperative relation to a roll or cylinder such as is employed in a paper making machine, the cylinder and its supports beinr shown conventionally.

F ig.V 2 is a fragmentary plan view of the blade and a pair of its supporting plates.

Fig. 3 is a fragmentary perspective view of the supporting bar or rockshaft with one ofthe blade supporting plates thereon.

Fig. liis a detail section on line 4-4 of Fig. 2.

Fig. 5 is an edge view of one of the blade su porting plates.

eferring tothe drawing, 1 represents a roll or cylinder and 2 parts of the supporting frame, of a lpaper making machine. y

My improved doctor bar comprises a supporting bar or rockshaft 3 having journals j, 4at the ends thereof, one of these journals being commonly provided with pressure means or means for holding the doctorbar in its adjusted position. IIowever, as suitable mechanism for this'purpose is well known in the art and these details form no part of this invention, Ihave not illustrated the screws 8. 4The plates 6 have longitudinal slots 9 extending from their outer ends, the `slots terminating in holes l0 punched in the plate. These holes are mainly provided to prevent tearing or splitting of the plates at the base of the slots, although the holes may be eliminated with quite satisfactory results. i These slits provide fingers 11 and 12, each plate having three fingers in. the embodiment i illustrated. The adjacent fingers are opposite] and outwardly curved providing vreat resiliency and also to "'permit the ends of the fingers to lie against or engage the blade, see Fig. 4. The blade is enga-ged Jwith the lingers with adjacent fingers engaging opposite sides of the blade as illustrated. In the embodiment illustrated the intermediate or central finger 12 engages the top of the blade. i

The inner edgesof the fingers 12 are beveled at 13 while the outer edges` of the fingers 11 are beveled at 14. This provides a thin feather-edge for the top lingers orv the lingers engaging the to of the blade so that the material scraped rom the cylinder passes. readily over the ,fingers and is not torn or piled up thereby. The beveling of the under fingers also provides a feather edge. This, however, is noty so important as the ;beveling of the top fingers, although it is a desirable feature.

To support the blade against longitudinal movement I notch or shoulder the same at 15, this shoulder en aging the intermediate finger of the outer p ate, thereby supporting the blade against longitudinal movement.

My improved doctor bar is highly' eflicient as the blade is not only resiliently supported but may be of resilient material so that it conforms to the roll. A further advantage is that in order to be eli'ective it is not necessary that it be urged against the cylinder under heavy pressure which, when the blades are .of rigid heavy material as is common practice, results in a large amount of wear and frequently an uneven wear, necessitating the truing of the rollers or cylinders/ This is expensive, not only on account of'the actual truing labor,but the removing of the cylinder from the machine and the consequent shutting down "of the machine while the roll 'is being removed and trued or af'new roll introduced. L A

I have yillustrated and described my improvements in an embodiment which I have los found highly satisfactory. I have not atteni ted to illustrate or describe various enibodiments which I contemplate as it is believed that this disclosure will enable those skilled` in the art to embody or adapt my improvements as may be desired.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. In a dotor bar, the combination of a sup rting bar, a relatively thin blade, and a p urality of spring blade supporting plates secured to said supporting bar, said plates being longitudinally slit at their outer ends providing a plurality of spring blade eng ing fingers, adjacent fingers being opposite y curved and engaging opposite sides of the blade, the lingers engaging the bop side of the blade being beveled on their inner edges and the fingers engaging the underside of the blade being beveled on their outer edges, one end of said blade being notched pro- ,viding a stop'coacting with the edge of the top finger of one of the lates supporting the blade against longitudinal movement.

2. In a doctor bar, the combination of a supporting bar, a relatively thin blade, and a plurality of spring blade supporting plates secured to said supporting bar, saidD plates bein longitudinally slit at their outer ends providing a plurality of spring blade ens gaging lingers, adjacent lingers being oppositely curved and engaging opposite sides of the blade, the fingers engaging the top side of the blade being beveled on their inner edges and the side of the blade being beveled on their outer e ges.

3. In a doctor bar, the combination' of a supporting bar, a relatively thin blade, and a plurality of spring blade support' plates secured to said supporting bar, sai plates being longitudinally slit at their outer ends providingv a plurality of spring blade engaging lingers, adjacent fingers being op ositely curved and engaging opposite si es of the blade, one end of said blade being notched providin a stop coacting with the edge of the top ger of one of the plates supporting the blade against longitudinal movement.

4. In a doctor bar, the combination of a sup orting bar, a relatively thin blade, and a p urality of spring blade support' plates secured to said supporting bar,'siiil plates being longitudinally slit at their outer ends providing a plurality of sprin blade engaging ngers, adjacent fingers ing op ositely curved and engaging opposite of the blade. y

5. In a doctor bar, the combination of a supporting bara resilient blade, and a plurality of spring blade supporting plates carried by said supporting bar, said plates being slit at their outer ends providing a ers engaging the under pluralit of spring blade engaging iingers dispose with adjacent fingers engaging opposite sides of the blade, the fingers engaging the top side of the blade bein beveled on their inner edges, said blade stop engaging one of the plates supporting the blade against longitudinal movement.

6. In a doctor bar, the combination of a supporting bar, a resilient blade, and a plurality of spring blade supporting plates carried by said supporting bar, said plates being slit at their outer ends providing a plurality of spring blade engaging lingers disposed with adjacent fingers engaging opposite sides of the blade, the tingers enga ing the top side of the blade being bevele on their inner edges.

7. In a doctor bar, the combination of a supporting bar, a resilient blade, and a plurality. of spring blade supporting plates carried by said supporting bar, said plates being slit at their outer ends providing a plurality of spriig blade engaging fingers disposed ivitli. a jacent tin ers engaging op osite sides of the blade? said blade haviig a stop engaging one of the plates supporting the blade against longitudinal movement.

8. In a doctor bar, the combination of a supporting bar, a resilient blade, and a plurality of spring blade supporting plates carried by said supporting bar, said plates being slit at their outer ends providing a plurality of spring blade engaging fingers disposed with adjacent fingers engaging opposite sides of the blade.

9. In a doctor bar, the combination of a supporting bar, a resilient blade, and a plurality of spring blade supporting members carried by said supporting bar and each provided with spring blade engaging fingers disposed with adjacent fingers e aging opposite sides of the blades, the en of the tiners engaging the top of the blade being reveled on their inner edges and the ends of the lingers engaging the under side of the blade being beveled on their outer edges.

l0. In a' doctor bar, the combination of a supporting bar, a resilient blade, and a lurality of sprin blade supporting me ers carried by sai supporting bar and each provided with spring blade engaging lingers disposed with adjacent fingers engaging opposite sides of the blades.

11. In a doctor bar the combination of a resilient blade, and a plurality of spr blade supporting members each providld with opposite spring blade engaging fingers engaging opposed sides of the blade.

12. In a doctor bar the combination of a resilient blade, and a plurality of sprin blade supporting members each provid with spring blade engaging engaging opposite sides of the blade and whereby the blade is removably supported.

13. In a doctor bar, the combination of a avinga" support-ing bar, a resilient blade, and a plu resilient blade, and a plurality of blade suprality of spring blade supporting members porting members provided with spring fincarried by said supporting bar and each progers engaging opposite sides of the blade. 10 vided with coaeting blade engaging fingers In Witness whereof. I have hereunto set my engaging the blade from opposite sides hand.

thereof.

14. In a doctor bar, the combination of a CLAUDE IVES. 

